No remodel changes your daily life per square foot like a bathroom — and no remodel punishes shortcuts like one. Everything in a bathroom lives around water, and the difference between a 20-year bathroom and a mold problem is the waterproofing you never see: proper shower pan systems, waterproof membranes, and correctly sloped, flood-tested pans before a single tile goes on. That’s our standard, on every shower, every time.
Scope we handle
- Tub-to-walk-in-shower conversions
- Custom tile showers and niches
- Frameless glass enclosures
- Vanities, counters and lighting
- Toilets and fixtures
- Heated floors
- Full gut renovations and accessibility builds
Waterproofing, in detail
Tile is not waterproof. Grout is not waterproof. The assembly behind them is what keeps water out of your framing, and it is entirely invisible once the tile is on — which is exactly why it’s the easiest place for a cheap bid to save money.
- A proper pan system with correct slope to the drain, built to fall consistently across the whole floor rather than dishing near the drain.
- A continuous waterproof membrane — sheet or liquid-applied — over the pan and up the walls to the required height, with every seam, corner and change of plane treated.
- A flood test before tile. The drain is plugged, the pan is filled, and it sits. This is the only way to know the assembly holds, and it can only be done at this stage. We do it every time.
- Waterproofed niches and benches. These are the two most commonly leaked details in a custom shower, because they’re both horizontal surfaces inside the wet area. A niche needs slope and full membrane coverage, not just tile.
- Correct backer board — cement board or a foam board system, never ordinary drywall inside the shower.
- Pre-slope under a traditional mortar bed, where that method is used.
Curbless showers and linear drains are popular and both are entirely achievable — they simply demand more of the waterproofing and of the floor structure, because the slope has to be built into the subfloor rather than on top of it.
Ventilation is the other half of mold prevention
A perfectly waterproofed bathroom can still grow mold if the moisture has nowhere to go. Three things matter: a fan sized for the room’s volume rather than whatever was there before, ducting that runs to the exterior — not into the attic, which is a surprisingly common and genuinely damaging shortcut — and a run that’s short and smooth enough that the fan actually moves its rated air. A humidity-sensing or timer switch is worth it, because the fan needs to run well after the shower stops, and nobody does that manually.
The tub-to-shower conversion
The tub-to-shower conversion is our most requested bathroom project, by far: a rarely-used tub becomes a spacious walk-in shower, and the bathroom instantly feels twice its size. The practical considerations are drain relocation, whether the new shower’s footprint changes the wall layout, and glass — a frameless panel keeps the room visually open where a framed enclosure and a curtain both close it down.
The one question worth pausing on is resale: a house with no bathtub anywhere can narrow its buyer pool with families. If it’s your only tub, that’s a real consideration; if there’s another tub in the house, it rarely is. We think through it with you rather than just selling the conversion — there’s more on the trade-off in walk-in shower vs tub.
Making a small bathroom work
Most San Diego bathrooms that frustrate their owners aren’t badly finished — they’re badly organised. What actually buys space: a wall-hung or floating vanity that shows floor beneath it, a curbless or low-profile entry that removes a visual break, a frameless glass panel instead of a curtain, a recessed niche instead of a caddy, larger-format tile with fewer grout lines, and a pocket or outswing door where an inswing door is eating the only clear floor. Moving the toilet a few inches is sometimes the whole unlock. More in small bathroom issues.
Tile, and why flatness matters
Large-format tile is the current preference and it’s less forgiving than it looks: the bigger the tile, the flatter the substrate has to be, because any deviation shows up as lippage — one edge sitting proud of its neighbour. That’s a substrate problem, not an installer’s trowel problem, and it’s fixed before tiling or not at all.
On grout: standard cementitious grout with a good sealer is fine for most walls and floors. Epoxy grout costs more and is harder to install, and it’s genuinely worth considering on a shower floor or anywhere you want stain resistance without maintenance. Colour choice matters more than people expect — grout close to the tile colour reads as a calm surface, contrasting grout emphasises the grid, and very light grout on a floor will show traffic.
Accessibility, if you’re staying put
If this is the bathroom you intend to grow old in, the time to build for that is now, while the walls are open. A curbless entry, a wider door, blocking in the walls for grab bars you can add later, a bench, a handheld on a slide bar, comfort-height fixtures and good even lighting are all far cheaper installed during the remodel than retrofitted. Blocking in particular costs almost nothing now and is a wall-opening job later.
What drives the cost
- Whether fixtures move. Keeping the toilet, shower and vanity in place is far cheaper than relocating drains — especially on a slab.
- Shower size and complexity — niches, benches, curbless entries and linear drains all add labour.
- Tile choice and layout — large format, mosaics, patterns and full-height walls all move the number.
- Glass — frameless is a significant step up from framed.
- Fixture tier, and whether a thermostatic or multi-outlet valve is involved.
- Heated floors, which need their own circuit and thermostat.
- What’s behind the walls — old galvanised supply or cast-iron drain lines discovered at demolition.
- Number of bathrooms in the project.
See bathroom remodel cost in San Diego for a fuller breakdown, and bathroom remodel planning for the sequence.
Common questions
How long does a bathroom remodel take?
Most full remodels run 2–4 weeks of construction, depending on scope and material lead times.
What’s the most popular project?
The tub-to-shower conversion, by far: a rarely-used tub becomes a spacious walk-in shower, and the bathroom instantly feels twice its size.
Do I need a permit?
Replacing fixtures in place generally doesn’t. Moving plumbing, altering the layout, adding circuits for heated floors or changing a window does. We handle it as part of the project.
Can I use the bathroom during the remodel?
Not the one being remodelled. If it’s the only full bathroom in the house, that’s worth planning around before we start rather than discovering on day two.
Is a prefabricated shower base cheaper than tile?
Yes, and it’s a perfectly sound choice — an acrylic base is fast, reliable and easy to clean. Tile buys you custom dimensions, curbless entries and the look. Both work; they’re different budgets and different results.
How do I know the waterproofing was done right?
Ask to see the flood test. Any contractor doing it properly will happily show you a filled pan sitting before tile goes down. If a bid doesn’t mention a membrane system or a flood test at all, that’s the thing to ask about — not the tile.
Start your bathroom
We’re a licensed San Diego general contractor, CSLB #1159596. Call (858) 392-6767 for a walkthrough — or see interior remodeling for the full range and whole house remodeling if more than one room is in scope.
Where we build this
Searching for bathroom remodeling near you? IO Builders Group handles bathroom remodeling across San Diego County from our Scripps Ranch office, including:
Also serving Rancho Bernardo, Encinitas and Solana Beach. Licensed design-build general contractor, CSLB #1159596.
